Ignore empty hover contents, trim final hover label text

crates/project/src/project.rs

@@ -425,6 +425,12 @@ pub struct Hover {
     pub language: Option<Arc<Language>>,
 }
 
+impl Hover {
+    pub fn is_empty(&self) -> bool {
+        self.contents.iter().all(|block| block.text.is_empty())
+    }
+}
+
 #[derive(Default)]
 pub struct ProjectTransaction(pub HashMap<ModelHandle<Buffer>, language::Transaction>);